<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="../../../lib/reset.css/reset.css">
    <link rel="stylesheet" href="../../../lib/bootstrap@3.3.4/css/bootstrap.min.css">
</head>

<body>
    <video width="250px" height="200px" controls loop autoplay muted poster="./img/3.jpg" id="myVideo">
        <source src="../5/video/天行九歌 (1) (1).mp4">
        <button>播放/暂停</button>
        <script>
            btn.onclick = function () {
                if (myVideo.paused) {
                    myVideo.play();
                } else {
                    myVideo.pause();
                }
            }
        </script>
</body>

</html>